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Two carts A and B, are placed on an air ...

Two carts A and B, are placed on an air track. They are made of same material and look identical. B is given a constant speed and collides elastically with A at rest. After the collision, both carts move in same direction. One concludes that:

A

A is hollow

B

B is hollow

C

A and B are identical

D

any of first three answers is possible.

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The correct Answer is:
A
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